Search results for "antimony"
showing 10 items of 163 documents
Antimony-121 mössbauer and infrared spectral study on halophenylantimonate(III) Compounds
1981
Abstract The synthesis and the 121 Sb Mossbauer and infrared spectra of halophenylantimonates(III) M[PhSbX 3 ] (M Me 4 N, Ph 4 As;X Cl, Br, I) are reported, and the spectral data are discussed and compared with those of SbX 4 and other related systems. The results are in accord with the participation of the antimony 5s electrons in the SbPh bond. In the interpretation of the electric field gradient, the contributions to V zz from both the lone pair and the SbPh bond electron densities are assumed to be dominant.
Synthesen und Strukturen von Ethyl‐, Propyl‐, Butyl‐ und Mesitylantimon
1989
Die Enthalogenierung von Alkylantimondibromiden RSbBr2 (R = Et, Pr, Bu) mit Mg in THF fuhrt zu gelben Losungen, die uberwiegend die Antimonfunfringe (RSb)5 neben den Vierringen (RSb)4 enthalten. Die Trimeren (RSb)3 konnen massenspektrometrisch nachgewiesen werden. Beim Entfernen des Losungsmittels bilden sich reversibel die Polymeren (RSb)x (x » 5) in Form schwarzer Festkorper. In den Ringen nehmen die Substituenten R maximale trans-Positionen ein. Die Kristallstruktur von (MesSb)4 · Benzol enthalt linear …Sb4…Sb4…-verknupfte Cyclotetrastiban-Aren-Komplexe mit guter η6-Haptizitat des Benzolmolekuls an eines der vier Sb-Atome (Ringmitte…Sb 3.81 A, Winkel zur Flachennormale 5°). Der Sb4-Ring …
Investigation of the Thermoelectric Properties of the Series TiCo1-xNixSnxSb1-x
2010
The effect of the simultaneous substitution of cobalt by nickel and antimony by tin in the solid solution TiCo1–xNixSnxSb1–x was systematically investigated. The number of valence electrons does not change by this substitution and therefore the resistivity stays semimetallic or semiconducting. The series were synthesized by arcmelting and the thermoelectric properties were determined. It was found out that the substitution of cobalt and antimony by nickel and tin reduces the thermal conductivity to 2 W·m–1·K–1 at 400 K. The reduction is caused by titanium rich prolate micro structures that were found by energy dispersive X-ray spectroscopy investigations. The Seebeck coefficient and the res…
Arsenic, antimony and bismuth complexation by L-cysteine in water
1984
Synthese, dans l'eau, des complexes L-cysteine: AsL 3 , SbL 3 •H 2 O et BiL 3 .H 2 O L=forme monoanionique de cysteine. Etude IR des structures
Zirconocene [Cp2Zr] synthon and benzynezirconocene complexes as tools in main group element chemistry
1998
Abstract Interactions between zirconocene or benzyne zirconocene and unsaturated species incorporating main group elements lead to a variety of new metallaheterocycles. Efficient new methodologies of regiospecific syntheses of mono-, bi-, or tricyclic systems incorporating phosphorus, nitrogen, selenium, antimony, germanium or tin are reported.
Preparation, crystal structure, and infrared characterization of the first thiocyanato-oxy-antimonate(III) [(CH3)4N]2[Sb6O4(NCS)12]
1995
The salt [(CH3)4N]2[Sb6O4(NCS)12] is the first identified thiocyanato-oxy-antimonate(III) complex. Reported are details of the synthesis, relevant infrared data and its x-ray structure. The compound crystallizes in the triclinic space group P1 with Z = 2 (C10H12N7O2S6Sb3) and unit cell dimensions a = 11.314(6), b = 12.846(3), c = 8.679(2) A; α = 91.93(3)°, β = 90.31(3)° and γ = 99.13(3)°. It contains centrosymmetric [Sb6O4(NCS)12]2− anions packed with isolated tetramethyl-ammonium cations. The fundamental structural element of the anion is provided by the fusion of three SbOSbO rings forming a zig-zag portion of a ribbon, only slightly pleated. Peculiar is the unequivalence of the six thioc…
Synthesis and characterization of some arsenic, antimony and bismuth complexes of 2-mercaptoaniline
1983
Abstract The complexes of arsenic, antimony and bismuth as well as phenylantimony and phenylbismuth with monoanionic 2-mercaptoaniline are reported. IR spectra are consistent with chelating behaviour of the ligand but only a weak nitrogen to metal bonding interaction is advanced. The mass spectra fragmentation pattern is also presented. It can be interpreted with the loss of successive ligand units and, as a general feature, the abundance of a given ion decreases as the mass of the metal increases. Species with one or two protons less give more intense peaks possibly corresponding to ions containing the dianionic form of the ligand.
Heterocyclic systems containing antimony (III) -VIII . Hypervalency by intramolecular 1,5-chelation Sb · · · N in rings RSb [ (CH2) 3] 2NR′ (NR′ = NM…
1998
Abstract Eleven antimony compounds RSb [ (CH2) 3] 2 NR′ and eight germanium compounds R2Ge [ (CH2) 3] 2 NR′ (some combinations of R = Cl, I, NCS, OSiPh3, Ph, and NR′ = NMe, NBz, NBui) have been synthesized by diGrignard reactions and subsequent treatment with AgSCN, Ph3SiONa or PhLi. The compounds were compared to 14 Sn, 1 As, 5 Sb and 4 Bi analogues taken from the literature. Evidence is provided for 1,5-chelation Sb · · · N via crystal structure determinations (5+1 (lit) Sb compounds) , 13C- and 29Si-NMR chemical shifts, 12;Sb and 12;I Mossbauer data (11 and 3 Sb compounds, respectively) , cyclic voltammetry (9 Sb compounds) and semi-empirical MO calculations on the Extended Huckel level …
Synthesis and characterization of mixed catecholate and 1,10-phenanthroline complexes of antimony(III), C6H4O2SbX·1,10-phenanthroline (X F, Cl, Br,…
1982
Abstract The title compounds have been easily synthesized by reacting antimony(III) catecholates, C 6 H 4 O 2 SbX, with 1,10-phenanthroline. The infrared spectra of the solids are in accordance with a chelating behaviour of the phenanthroline ligand and the molecular monomeric nature of the fluoride derivative. In the case of the chloride, and possibly also for X Br and I, infrared data are better interpreted admitting a consistent ionic SbX bond interaction. The conductance data for their methanolic solutions also indicate a distinctive behaviour of the fluoride derivative, this being weakly ionized, whereas the remaining halides behave as 1:1 electrolytes. The main features of the mass…
Assessment of a possible genotoxic environmental risk in sheep bred on grounds with strongly elevated contents of mercury, arsenic and antimony.
1996
A part of Northern Palatinate country (Germany) was formerly influenced by mercury mining. Today, in many cases agricultural and housing areas are placed onto or near to former dump grounds of rubble. In the soil of these areas the concentration of mercury, arsenic and antimony was found ranging from basic natural contents up to strongly elevated levels. In a biomonitoring project, sheep bred on grounds contaminated with mercury (range 1-435 mg Hg/kg dry matter), arsenic (range 17-147 mg As/kg dry matter) and antimony (range 2-15 mg Sb/kg dry matter) were taken as example on the uptake of these elements from the environment and for possible effects of this exposure. Significantly elevated m…